儿茶素-金属改性丝素纤维复合竹浆纸的制备及性能研究

Preparation And Performance Of Bamboo Pulp Paper Composited With Catechin-Metal Modified Silk Fibroin Fibers

关键词:  儿茶素  配位键  丝素纤维  竹浆纤维  复合  

Key Words:catechin  coordination bond  silk fibroin fiber  bamboo pulp fiber  composite material  

摘要:本文基于儿茶素分子所含酚羟基、丝素纤维侧链羧基均可与金属离子发生配位结合的作用机制，以浓度分别为 0.1 mol/L Ag?、0.3 mol/L Zn²?、0.5 mol/L Ti??的钛 - 银 - 锌三元复合金属离子体系为配位桥梁，通过调控体系 pH 值，使金属离子同步与儿茶素、丝素纤维形成配位键交联，构筑得到儿茶素 - 金属离子 - 丝素纤维三维复合网络结构；实验控制儿茶素、丝素纤维与复合金属离子溶液的质量配比为 1:1:200。采用傅里叶红外光谱（FTIR）、扫描电子显微镜（SEM）、热重分析（TGA）、抗张力测试对改性丝素纤维进行表征，测试结果表明，改性后丝素纤维表面生成金属结晶沉积物，材料热稳定性能显著改善。进一步将改性丝素纤维与竹浆纤维按质量比 3:7 共混抄造，制备功能性纸基复合材料。对比普通纸张开展力学强度测试、UVB313 紫外耐候老化实验及抗菌性能检测，结果证实该复合纸材力学强度得到明显提升，且对金黄色葡萄球菌、大肠杆菌、白色念珠菌均具备良好的抑制效果。

Abstract:This paper based on the mechanism that phenolic hydroxyl groups of catechin and side-chain carboxyl groups of silk fibroin fibers are capable of coordinating with metal ions, a ternary Ti–Ag–Zn composite metal ion system with concentrations of 0.1 mol/L Ag?, 0.3 mol/L Zn²? and 0.5 mol/L Ti?? was adopted as the coordination bridge. By modulating the pH of the reaction system, the metal ions simultaneously formed coordinate bonds to crosslink catechin and silk fibroin fibers, thereby constructing a three-dimensional composite network of catechin-metal ion-silk fibroin fiber. The mass ratio of catechin, silk fibroin fiber and composite metal ion solution was controlled at 1:1:200 in the experiment. The modified silk fibroin fibers were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and tensile strength testing. The test results reveal that metallic crystalline deposits form on the surface of modified silk fibroin fibers, and the thermal stability of the material is significantly improved. Subsequently, the modified silk fibroin fibers were blended with bamboo pulp fibers at a mass ratio of 3:7 for papermaking to fabricate functional paper-based composite materials. Mechanical strength tests, UVB313 ultraviolet weathering aging experiments and antibacterial performance tests were carried out in comparison with ordinary paper. The results verify that the mechanical strength of the composite paper is markedly enhanced, and it exhibits excellent inhibitory effects against Staphylococcus aureus, Escherichia coli and Candida albicans.